Sources

-https://www.voronoiapp.com/military/Russia-Steps-up-Its-Drone-Strikes-Against-Ukraine-5435
-https://www.aljazeera.com/news/2025/6/23/massive-russian-air-assault-kills-at-least-six-in-ukraines-capital-kyiv
-https://www.csis.org/analysis/calculating-cost-effectiveness-russias-drone-strikes
-https://en.defence-ua.com/news/what_is_the_real_price_of_russian_missiles_about_the_cost_of_kalibr_kh_101_and_iskander_missiles-4709.html
-https://en.topwar.ru/208074-amerikanskoe-izdanie-ukraina-sbivaet-deshevye-drony-raketami-v-7-10-raz-dorozhe.html